SmartBridges sB3010 Configuring Spanning Tree Protocol STP, Bridge Configuration Information

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Figure 2-18 Bridge Configuration Information

2.6.4 Configuring Spanning Tree Protocol (STP)

STP is a Layer 2 link management protocol that provides path redundancy while preventing loops in the network. For a Layer 2 Ethernet network to function properly, only one active path can exist between any two redundant links.

To create a fault-tolerant network, there needs to be a loop-free path between all nodes in the network. The Spanning Tree Algorithm calculates the best loop-free path throughout a Layer 2 network. Infrastructure devices such as wireless bridges and switches send and receive spanning tree frames, called Bridge Protocol Data Units (BPDUs), at regular intervals. The devices do not forward these frames but use them to construct the loop-free path.

Multiple active paths among end stations cause loops in the network. If a loop exists in the network, end stations might receive duplicate messages. Infrastructure devices might also learn end-station MAC addresses on multiple Layer 2 interfaces. Such conditions result in an unstable network.

STP defines a tree with a root bridge and a loop-free path from the root to all infrastructure devices in the Layer 2 network.

STP forces redundant data paths into a standby (blocked) state. If a network segment in the spanning tree fails and a redundant path exists, the Spanning Tree Algorithm recalculates the spanning tree topology and activates the standby path.

When two interfaces on a device are part of a loop, the spanning tree port priority and path cost settings determine which interface is put in the forwarding state and which is put in the blocking state. The port priority value represents the location of an interface in the network topology and how well it is located to pass traffic. The path cost value represents the media speed.

airHaul™ Nexus User Guide

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Contents Version AirHaul Nexus SB3010Table of Contents T e l l i g e n t w i r e l e s s A t f o r m Overview of User Guide About This DocumentTechnical Support Center Related PublicationsIntroduction AirHaul Nexus Configuration FeaturesSystem Requirements Pre-Installation Checklist for airHaul ChecklistsSignature of Engineer Name Date Parameters Units Site a Site BPTP Post-Installation Checklist for airHaulChecklist Parameters Units Site a Site B User Login and License Agreement AirHaul Nexus ConfigurationAdministrator Login License Agreement Web GUI Administrator Password Change Administrator password change Using the Configuration PagesRadio Navigation Menu BarMenu Functions Menu Item Menu Sub-items Description Home NetworkingTools Menu Item Menu Sub-items DescriptionMenu Item Menu Sub-items Description Tools Help Radio Operational Mode Settings Device Mode ConfigurationRoot Bridge to Remote Router Root Bridge to Remote BridgeChanging Root Bridge to Remote Router Remote Bridge to Root Bridge10 Changing Remote Bridge to Root Bridge Remote Router to Root Bridge11 Changing Remote Router to Root Bridge Remote Router to Remote Bridge12 Changing Remote Router to Remote Bridge Remote Bridge to Remote Router13 Changing Remote Bridge to Remote Router Ethernet Configurations Root Bridge Configuration15 Root Bridge Wireless Settings Wireless ConfigurationsItems Descriptions Wireless SettingsDial a Power Authorization16 Root Bridge Association List Bridge Configuration18 Bridge Configuration Information Configuring Spanning Tree Protocol STPSTP Settings Configuration Radio port Radio a Setting Default Value Range Purpose19 Bridge Configuration Ethernet Configuration Remote Bridge Configuration21 Remote Bridge Wireless Settings Wireless Configuration22 Remote Bridge Association with Root Bridge 23 Remote Router Ethernet Configurations Remote Router Configuration24 Remote Router Wireless IP Configuration 25 Remote Router Wireless Association Settings Dhcp Configurations 27 Dhcp Server Configurations 29 Dhcp Relay Agent Configurations Dhcp Relay Configurations30 Routing Table Routing Table31 Adding Static Route Wireless Settings Wireless Settings ManagementData Encryption 32 Data Encryption Configuration Performance Parameters and Bandwidth Controller Link Performance Parameters and FeaturesOptimizer Choose the desired Radio Operating modeRadio Operating ThroughputBandwidth Controller Enter Maximum Wireless ThroughputSite Survey showing associated devices Site SurveyAntenna Alignment Antenna Alignment Ethernet Traffic Statistics Traffic StatisticsEthernet Traffic Statistics Received Multicast Packets Received ErrorsWireless Traffic Statistics Transmit Success Rate Received Frame FCS Error CountTools System ConfigurationReset To Factory ResetDelayed Reset Version Edit ConfigurationSnmp Security Check the ‘SNMP Access Filters’ Enable boxDelayed Reset Settings Reset OptionsProfile Manager NTP Time Server SetupFunction Descriptions Profile ManagerLoad Operating Profile Save ProfileProfile calendar Scheduling a Profile Ping Test Result Link TestClick on the ‘Radio Receive’ or ‘Radio Transmit’ button Throughput TestThroughput Test Result Click the ’Compute Distance’ button Link Budget Planning12 Link Budget Planning Calculator Link Budget AirHaul Nexus Firmware Upgrade Firmware UpgradeAirHaul Nexus Firmware Upgrade Firmware transferred Radio Mode of OperationsAppendix a Points to Remember AntennaRange Throughput OptimizerPerformance FragmentationMultiple watchdog timer Firmware upgradeAcronyms and Abbreviations Appendix B Useful terms and definitionsWPA Dhcp Appendix C Sample airHaul Bridge to Router Setup Value Appendix D Snmp TrapAirPoint AirClient Appendix E Snmp MIB Appendix F License